And this becomes even more true as the thing with moving parts becomes more expensive. For an excavator which costs several hundred thousand dollars, when a sh

And this becomes even more true as the thing with moving parts becomes more expensive. For an excavator which costs several hundred thousand dollars, when a shaft wears out of spec, they send it to a welder to apply more metal, then onto the lathe to trim it back into spec. In other words, when the equipment gets expensive enough, parts which you wouldn't normally consider to be maintainable become maintenance items.